package map;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class MapDemo3 {
    public static void main(String[] args) {
        Map<String,Integer> map = new HashMap();
        map.put("语文",99);
        map.put("数学",93);
        map.put("英语",98);
        map.put("物理",97);
        map.put("化学",94);
        System.out.println(map);

        Set<String> keyset = map.keySet();
        for (String key : keyset){
            System.out.println("key:"+key);
        }
        System.out.println("-------------------------------------------------------------");

        Collection<Integer>  values = map.values();
        for (Integer value : values){
            System.out.println("value:"+value);
        }

        Set<Map.Entry<String,Integer>> entrySet = map.entrySet();
        for (Map.Entry<String,Integer> e : entrySet){
            String key = e.getKey();
            Integer value = e.getValue();
            System.out.println("key:"+key+",value:"+value);
        }
    }
}
